Elevator apparatus.



"No. 728,338- I PATBNTED MAY 19,1903.

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ELEVATOR APPARATUS.

APPLICATION FILED 00121, 1899.

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PATBNTED MAY19, 19:03. I I. n. VBNN. ELEVATOR APPARATUS.

APPLICATION FILED 0012.21, 1899.

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UNITED STATES f Patented May 19, 1903.

- PATENT OFFICE.

ISAAC H. VENN, OF YONKERS, NEW YORK,ASSIGNOR TO OTIS ELEVATOR COMPANY, OF EAST ORANGE, NEW JERSEY A CORPORATION OF NEW JERSEY.

ELEVATOR APPARAT-U s.

SPECIFICATION forming part of Letters Patent No. 728,338, Clated May 19, 1903.

Application filed October 21, 1899. Serial No. 734,354. (No model.)

To all whom it may concern:

Be it known that I, ISAAC H. VENN, a citizen of the United States, residing at Yonkers, Westchester county, State of New York, have invented certain new and useful Improvements in Elevator Apparatus, of which the following is a specification.

My invention relates to that class of elevator apparatus in which a car and a counterbalance and a motor movinginone direction are employed; and my invention consists in combining with these features-oer.

t-ain driven wheels capable of being driven at difierent relative speeds by the drivewheel and a continuous cable carried by said driven wheels and operating on blocks connected with the cage and weight, as fully set forth hereinafter and illustrated in the accompanying drawings, in which- Figure 1 is a plan View in part section of my improved elevator apparatus, except the car and counterbalance. Fig. 2 is a perspective diagrammatic view. Fig. 3 is'a side elevation.

The elevator car or platform X is suspended by a cable or flexible suspensory w,and the counterweight,which may be an overbalanceweight, is suspended by a cable y, and to the ends of the cables at and y are connected blocks '13 B. Theengine is provided "with two driven wheels AA, which are positively driven in reverse direction by a single motor so constructed that the respective rates of revolution of the drive-wheels may be varied, as desired.

Around the drum-wheels and. around the pulleys of the blocks B B passes acontinuous cable 0, the cable being formed into loops passing from the wheel A to the block B, thence beneath the wheel A and to the block B, and thence "down to the wheel A, so that it will travel with the reversely-"turning drive-wheels and pass from one to the other.

Solong as the drive-wheels turn at the same rate of speed the cable 0 travels through the blocks B B, merely turning the pulleys thereof; butif one of the wheels-say the wheel A- turns at a greater speed than the other the cable will be drawn from the Wheel A and paid out from the wheel A, so that the block B will be drawn downward and the draft on the block B will be relaxed and the block will rise, thus elevating-the car. If the'superior speed is imparted to the wheel A, the action and effect will be reversed, the car descending and the weight being elevated.

. One means of securing the direct driving of both drive-wheels from a single motor consists' in providing the motor with a drivewheel D, arranged between the wheels A A and frictionally engaging both to turn them in opposite directions. As shown, the wheels A A are paralIeL'turnin'g about a prolongation of the same axis, and each provided at its inner side with an annular groove or depression, the faces w of which iucross-section coincide with the arc of a circle. The face of the drive-wheel D coincides with the face w, and the center of the wheel D is concentric with the center of the circle which coincides with the opposite faces w. It therefore follows that when the wheel D bears at the center of each face w, as shown in Fig.1, the wheels A A will be driven at the same speed; but if the wheel D is turned so as to bear near the inner edge of the groove of one wheel-say the wheel A-and near the outer edge of the groove of the other wheel then the wheelA will increase in speed and the wheel A will decrease in speed. If the wheel D is swung in the opposite direction, the wheel A will be increased in speed and the speed of the wheel A will be in the relative speeds of the two wheels A A is effected without any jars or abrupt changes or cessation of or interference with the motion of the driven or drive wheels and that the speed of the drive-wheel may be constant and uniform.

' The wheel D may be driven from any suitable motor through the intervention of any suitable flexible gearingg. but, asshown, the wheel D is on a shaft at, having its bearings .upon a frame E, carrying a motor M, the said frame swinging about a pivot s, the axisof which is concentric with the circle coinciding with the opposite faces to w.

decreased. It will be evident that this'change In order to insure frictional adhesion of the driving and driven surfaces, I provide bearings for the outer faces of the wheels A A in the shape of rollers turning on studs on supports G G, pivoted to the base at their lower ends and connected by a boltfby tightening the nut on which the supports, with their rollers, may be drawn together to cause the wheels A A to hear more firmly on the drivewheel. Any othersuitable adjusting devices for shifting the rollers may be used.

To avoid drag or slippage of any part of the roller-bearing faces, the latter are beveled or conical, as shown. Undue wear is thus prevented.

As indicated, the motor M is an electric motor, and the frame E carries a shaft with a pinion b engaging a curved rack (Z, the pinion b having a grooved pulley c, from which an operating-cable extends, as usual, to the car, so that by operating the cable the frame may be swung in either direction to any desired extent. Any other suitable means of shifting the drive-wheel from the car may, however, be employed.

I do not here claim the combination of driven wheels and drive-wheels adjustable between curved inner faces of the driven wheels or the construction of these parts as shown, as this is the subject of Letters Patent No. 657,842, September 11, 1900.

teases Without limiting myself to the precise construction of parts shown, I claim 1. In an elevator apparatus, the combination of two wheels A A, an endless cable pass ing around each wheel and forming two loops, a block in each loop, a motor provided with a drive-wheel engaging both wheels A A and adjustable to bear on the Wheels at different distances from the centers thereof, a car connected to one of said blocks, a counterweight connected to the other block, and means constructed to be controlled from the car for effecting the adjustment of the drive-wheel of the motor.

2. The combination of the car, counterweight, suspensory cables, blocks and cable C, two driven wheels provided with annular inner faces transversely curved, a drive-wheel between said faces, and means constructed to be controlled from the car for shifting the drive-wheel to carry its bearing-points to or from the axes of the wheels, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ISAAC II. VENN.

Witnesses:

JAMES S. FITCH, ARTHUR ROWLAND. 

